Clamp YUV videos to their visible size in the shader

cc/quads/yuv_video_draw_quad.h

Index: cc/quads/yuv_video_draw_quad.h
diff --git a/cc/quads/yuv_video_draw_quad.h b/cc/quads/yuv_video_draw_quad.h
index e1c54109f65f32abeaf58ce5df706d0001c073a6..61f11a2743f5d9d962061e3f48db6d9a9b0f9b1d 100644
--- a/cc/quads/yuv_video_draw_quad.h
+++ b/cc/quads/yuv_video_draw_quad.h
@@ -30,6 +30,7 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
               const gfx::Rect& opaque_rect,
               const gfx::Rect& visible_rect,
               const gfx::RectF& tex_coord_rect,
+              const gfx::Size& tex_size,
               unsigned y_plane_resource_id,
               unsigned u_plane_resource_id,
               unsigned v_plane_resource_id,
@@ -42,6 +43,7 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
               const gfx::Rect& visible_rect,
               bool needs_blending,
               const gfx::RectF& tex_coord_rect,
+              const gfx::Size& tex_size,
               unsigned y_plane_resource_id,
               unsigned u_plane_resource_id,
               unsigned v_plane_resource_id,
@@ -49,6 +51,8 @@ class CC_EXPORT YUVVideoDrawQuad : public DrawQuad {
               ColorSpace color_space);
 
   gfx::RectF tex_coord_rect;
+  // Empty texture size implies no clamping of texture coordinates.
+  gfx::Size tex_size;
   unsigned y_plane_resource_id;
   unsigned u_plane_resource_id;
   unsigned v_plane_resource_id;